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The Infinite Is the Chasm in Which Our Thoughts Are Lost: Reflections on Sophie Germain’S Essays

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The Infinite Is the Chasm in Which Our Thoughts Are Lost: Reflections on Sophie Germain’S Essays Chapman University Chapman University Digital Commons Mathematics, Physics, and Computer Science Science and Technology Faculty Articles and Faculty Articles and Research Research 2020 The Infinite is the Chasm in Which Our Thoughts are Lost: Reflections on Sophie Germain's Essays Adam Glesser Bogdan D. Suceavă Mihaela Vajiac Follow this and additional works at: https://digitalcommons.chapman.edu/scs_articles Part of the History of Science, Technology, and Medicine Commons, and the Number Theory Commons The Infinite is the Chasm in Which Our Thoughts are Lost: Reflections on Sophie Germain's Essays Comments This article was originally published in Memoirs of the Scientific Sections of the Romanian Academy, tome XLIII, in 2020. Creative Commons License This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License. Copyright The Romanian Academy Memoirs of the Scientific Sections of the Romanian Academy Tome XLIII, 2020 MATHEMATICS THE INFINITE IS THE CHASM IN WHICH OUR THOUGHTS ARE LOST: REFLECTIONS ON SOPHIE GERMAIN’S ESSAYS ADAM GLESSER1*, BOGDAN D. SUCEAVĂ2* AND MIHAELA B. VAJIAC3 1Associate Professor, Department of Mathematics, California State University Fullerton, CA, 92834-6850, U.S.A. 2Professor, Department of Mathematics, California State University Fullerton, CA, 92834-6850, U.S.A. 3Associate Professor, Faculty of Mathematics, Schmid College of Science and Technology, Chapman University, Orange, CA 92866, U.S.A. *Adam Glesser and Bogdan D. Suceavă are two of the recipients of the Mathematical Association of America's Pólya writing Award on 2020, for their paper co-authored with Matt Rathbun and Isabel Marie Serrano, Eclectic illuminism: applications of affine geometry, College Mathematical Journal 50 (2019), no. 2, 82–92. Sophie Germain (1776–1831) is quite well-known to the mathematical community for her contributions to number theory [17] and elasticity theory (e.g., see [2, 5]). On the other hand, there have been few attempts to understand Sophie Germain as an intellectual of her time, as an independent thinker outside of academia, and as a female mathematician in France, facing the prejudice of the time of the First Empire and of the Bourbon Restoration, while pursuing her thoughts and interests and writing on them. Sophie Germain had to face a Adam Glesser et al. double challenge: the mathematical difficulty of the problems she approached and the socio-cultural context of her time, which never fully supported her interests, never appropriately rewarded her, and never allowed her to enjoy the recognition she deserved. In our attempt to understand the innermost Sophie Germain, we also try to grasp the place of her personality within her time and historical period. We will argue that she represents a unique case in both the history of mathematics and the context of Western European intellectuals at the beginning of the 19th century, deserving a further exploratory study of the connections of her work with the ideas of her time. Deservingly, toward the end of the twentieth century, Sophie Germain’s works received attention in several thorough and useful inquiries, [e.g., 13-15]. However, a specialist during this same period deemed her work as not worthy of glory [18], and she was even described as a “minor author” [19]. This is why we posit that further analysis and careful discussion of her intellectual achievements - mathematical or otherwise - is necessary. Our goal is to better assess her important contributions, and to invite the consideration of her achievements and vision in the same manner as the ones of her contemporaries, such as Gauss, Lagrange, Cauchy, and Poncelet. We will start our argument with the uncontroversial fact that Sophie Germain is the mathematician who first introduced the concept of mean curvature [9]. This concept is a fundamental one in differential geometry [3] and its introduction generated a profound discussion about minimality in the geometry of submanifolds that is still relevant today, and that led to the study of a plethora of new curvature invariants [3]. This turning point in differential geometry led to, among thousands of other results, the recent investigations on Willmore energy, which in turn brought us fundamental new results in differential geometry, such as the solution of the Wilmore Conjecture by Marques and Neves [12]. Sophie’s work also became a historical starting point 2 The infinite is the chasm in which our thoughts are lost: Reflections on Sophie Germain’s essays for the 2018 Abel Prize winner Karen Uhlenbeck or her work in geometric analysis [20]. We thus propose that Sophie Germain’s introduction of la courbure moyenne [9] defines her as a mathematician deserving of the highest attention for her mathematical vision and of the most profound recognition for her intellectual standing. Sophie Germain was a trailblazer both as a female mathematician and as a differential geometer introducing an important invariant used and generalized in today’s geometrical theories. Her influence eased the way for other mathematical giants, such as Emmy Noether, or later, Michelle Audin, Dusa Mc Duff, Chuu-Lian Terng, as well as the 2014 Fields Prize winner Maryam Mirzakhani. Following in her historical footsteps, we can see how these wonders of mathematics became inspiration for future generations of female mathematicians, may they be differential geometers, algebraists, or topologists. To better assess the complexity of Sophie Germain’s body of work in the context of her contributions to mathematical history as a woman mathematician, we should compare it with those of other important cultural giants who played a singular part in their respective historical period. One such comparison could be made with Christine de Pizan (1364–1430), one of the first professional writers in medieval Europe, a biographer of King Charles V, and a first-hand witness of a historical period, when her contemporary society descended into chaos and war. Barbero describes Christine de Pizan [1] as “thefirst feminist” and “une femme engagée”, i.e., an independent intellectual who acts according to her principles and convictions while responding to the challenges of her time. If Christine de Pizan definitely is such an intellectual, exactly in the terms described by Barbero, then we should discuss Sophie Germain’s imprint on the history of her times along the same lines, taking into account all aspects of her historical environment, from social prejudice, to her life in the time of war and social tensions that would lead to permanent changes to French society. As in 3 Adam Glesser et al. the case of Christine de Pizan, whose principles determined an attitude that today would be described as political, Sophie Germain did not hesitate to act in support of her values. For example, she did everything in her power, using all of her political influence, to protect Gauss when the French imperial army invaded his hometown (see her correspondence with General Pernety, who, in 1806, directed the siege of Breslau [10], pp. 316–317). Jane Austen (1775–1817) was another contemporary of Sophie Germain. Similar to Sophie, Jane Austen published anonymously, her name not appearing on her works until after her death. Her writing style presaged the literary realism movement, and the themes and political observations in her writing were so nuanced and important as to have legitimate claims by both conservatives and liberals. After comparing her appeal to Shakespeare and Dickens, Austen scholar John Mullan ([16], p. 2) writes that “...she did things with fiction that had never been done before. She did things with characterization, with dialogue, with English sentences, that had never been done before.” It is not surprising, then, that there are hundreds of works of literary criticism devoted to Jane Austen’s writings. We can only hope that Sophie’s work will receive the same type of interest as Jane’s literary and intellectual contributions. While her mathematics was astounding, the scope of Sophie’s intellectual brilliance is much wider. To better support our interest in all facets of her personality, we cite her volume of Philosophical Works, published in 1879 by Paul Ritti [10]. In particular, within this volume we refer the interested reader to a longer essay titled General considerations on the state of sciences and of the letters in different times of their cultures, a series of short essays titled Pensées, as well as previously unreleased letters. Important information on her private correspondence was investigated and published only recently by A. Del Centina [6,8], doing justice to such an interesting intellectual giant. All of these elements and texts should be taken into consideration when one discusses 4 The infinite is the chasm in which our thoughts are lost: Reflections on Sophie Germain’s essays Sophie Germain’s intellectual span and vision, and we feel that her intellectual life should be as important to the mathematical community as Jane Austen’s intellectual vision is to the literary community. Despite the above mentioned discussions of her philosophical works, we feel there is more to be done. Here, we briefly describe the main text in the volume titled by the editor Philosophical Works, i.e. the long essay General considerations on the state of sciences and of the letters in different times of their cultures. In the first chapter, Sophie Germain argues that, in various cultures, the development of sciences and the evolution of letters (including poetry and fiction) are governed by a common spirit while, in the second chapter, she starts by remarking that literature appeared in all world cultures before science. Her inquiry is not mathematical, and it definitely pertains to the philosophy of culture, as Sophie Germain is much interested in the origins of scientific inquiry, and this is best described in the following paragraph: “Les sciences n’existaient pas encore; mais le besoin d’expliquer s’était fair sentir.
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